You can also plot an uncertainty distribution of p, using an uninformed prior (uniform(0,1)), using beta(s+1, n-s+1) i.e.
x <- seq(0.091, 0.469, length=100) plot(x, dbeta(.x, shape1=13, shape2=39), xlab="x", ylab="Density", main="Uncertainy distribution for p: beta(a = 12+1, b = 50-12+1)", type="l") Cheers, Francisco Dr. Francisco J. Zagmutt College of Veterinary Medicine and Biomedical Sciences Colorado State University >From: Chuck Cleland <[EMAIL PROTECTED]> >To: Ethan Johnsons <[EMAIL PROTECTED]> >CC: r-help@stat.math.ethz.ch >Subject: Re: [R] binom.test >Date: Thu, 19 Oct 2006 11:27:35 -0400 > >Ethan Johnsons wrote: > > R-experts: > > > > A quick question, please. > > > >>From a lab exp, I got 12 positives out of 50. > > To get 90% CI for this , I think binom.test might be the one to be used. > > Is there a better way or function to calculate this? > > > >> binom.test(x=12, n=50, p=12/50, conf.level = 0.90) > > > > Exact binomial test > > > > data: 12 and 50 > > number of successes = 12, number of trials = 50, p-value = 1 > > alternative hypothesis: true probability of success is not equal to 0.24 > > 90 percent confidence interval: > > 0.1447182 0.3596557 > > sample estimates: > > probability of success > > 0.24 > >You might consider binconf() in the Hmisc package too: > >library(Hmisc) >binconf(12, 50, method="all") > PointEst Lower Upper >Exact 0.24 0.130610 0.381691 >Wilson 0.24 0.142974 0.374127 >Asymptotic 0.24 0.121621 0.358379 > > > thx much > > > > ej > > > > ______________________________________________ > > R-help@stat.math.ethz.ch mailing list > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide >http://www.R-project.org/posting-guide.html > > and provide commented, minimal, self-contained, reproducible code. > >-- >Chuck Cleland, Ph.D. >NDRI, Inc. >71 West 23rd Street, 8th floor >New York, NY 10010 >tel: (212) 845-4495 (Tu, Th) >tel: (732) 512-0171 (M, W, F) >fax: (917) 438-0894 > >______________________________________________ >R-help@stat.math.ethz.ch mailing list >https://stat.ethz.ch/mailman/listinfo/r-help >PLEASE do read the posting guide >http://www.R-project.org/posting-guide.html >and provide commented, minimal, self-contained, reproducible code. _________________________________________________________________ Stay in touch with old friends and meet new ones with Windows Live Spaces ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.